I have purchased recently a device from myO2. Whilst I was reviewing my details I noticed a mistake in my address and in order to correct it the system brought me some steps back in the procedure and asked me again for my payment details. In the end, I received a confirmation that I purchased only one device -as wanted- but I was charged twice. I am desperately trying to find a customer line services to address my issue but all I get is only pages not working. Any advice?